In Shanghai, about 20 demonstrators protested in front of the Consulate-General of Japan amid a heavy police presence. And almost 100 people marched through downtown Shenzhen, protesting Japan’s detention of the boat captain, while singing the Chinese national anthem.

About 70 protesters marched through central Hong Kong toward the Japanese consulate, chanting for the return of the ship’s captain and for Japan to stop claiming sovereignty over the Diaoyu Islands, according to an AFP report.